> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.
# upload
# `prefect_aws.bundles.upload`
S3 bundle steps for Prefect.
These steps allow uploading and downloading flow/task bundles to and from S3.
## Functions
### `upload_bundle_to_s3`
```python theme={null}
upload_bundle_to_s3(local_filepath: str, bucket: str, key: str, aws_credentials_block_name: Optional[str] = None) -> UploadResult
```
Uploads a bundle file to an S3 bucket.
**Args:**
* `local_filepath`: Local path to the bundle file
* `bucket`: S3 bucket name
* `key`: S3 object key (if None, uses the bundle filename)
* `aws_credentials_block_name`: Name of the AWS credentials block to use. If None,
credentials will be inferred from the environment using boto3's standard
credential resolution.
**Returns:**
* A dictionary containing:
* bucket: The S3 bucket the bundle was uploaded to
* key: The S3 key (path) the bundle was uploaded to
* url: The full S3 URL of the uploaded bundle (s3://bucket/key)
**Raises:**
* `ValueError`: If the local file does not exist
* `RuntimeError`: If the upload fails
### `main`
```python theme={null}
main() -> None
```
## Classes
### `UploadResult`
Result of uploading a bundle to S3.